...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Model dynamics of summertime low-level jets over northwestern Mexico
【24h】

Model dynamics of summertime low-level jets over northwestern Mexico

机译：墨西哥西北部夏季低空喷气机的动力学模型

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Using a fine-scale nested regional modeling system, the diurnal forcing of summertime low-level winds over the Gulf of California and northwestern Mexico is investigated. On diurnal timescales, simulated nocturnal low-level jets develop over the northern portion of the Gulf, the foothills of the Sierra Madre accidental, and parts of southern Arizona. The southerly component of the nocturnal jet is' the result of a geostrophic balance; involving the Coriolis force and a cross-gulf pressure gradient force associated with nighttime slope cooling over the elevated Sierra Madre Occidental. Additionally, horizontal temperature gradients over the sloped orography produce vertical variations in this cross-gulf pressure gradient force, generating the jet-like vertical shear in wind components above the nocturnal boundary layer; frictional effects are responsible for producing shear in the wind profiles below the boundary layer This balance is distinctly different from the inertial balance that is believed to be:responsible for the low-level jet over the Great Plains region of the United States. Daytime winds are part of a directly driven wind field forced dy horizontal pressure gradients associated with Slope heating (up the Sierra Madre Occidental) and sea-land temperature gradients (north of the Gulf). During synoptically forced surge events, a similar diurnal cycle in low-level flow is still present; however, the local thermal forcing appears to be superimposed upon the large-scale synoptic forcing, resulting in weaker up-slope flow during the day and stronger along-slope flow at night. [References: 33]
机译：使用精细的嵌套区域建模系统，研究了加利福尼亚湾和墨西哥西北部夏季低空风的昼夜强迫。在昼夜尺度上，模拟的夜间低空急流在海湾北部，马德雷山脉意外山麓和亚利桑那南部部分地区形成。夜流的最南端是地转平衡的结果。包括科里奥利力和跨海湾压力梯度力，与高架西马德雷山脉上的夜间斜坡冷却有关。另外，倾斜地形上的水平温度梯度会在该跨海湾压力梯度力中产生垂直变化，从而在夜间边界层上方的风分量中产生喷射状的垂直剪切力。摩擦效应是在边界层以下的风剖面中产生剪切力的原因。这种平衡与惯性平衡明显不同：惯性平衡被认为是：负责美国大平原地区的低空急流。白天的风是与坡度加热（西马德雷山脉上方）和海陆温度梯度（海湾北部）相关的直接驱动风场强迫dy水平压力梯度的一部分。在天气强迫的浪涌事件中，低空流量中仍存在类似的昼夜周期。然而，局部热强迫似乎叠加在大尺度天气强迫上，导致白天较弱的上坡流和夜间较强的沿坡流。 [参考：33]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号